Specifications

MMB-1 Mobile Mount for FT Series $19 $19 $23
XF-30C CW Filter 500 Hz $45 $40 $40
XF-30B AM Filter 6kHz $40
DC-1 DC Converter for EX Models $45 $50
Crystals Any FT-101 Crystal 160M-10M $5 $5 $5
DD-1 Digital Display (Spectronics Model) $169 $169
* - Indicates Advertisers offering "close-out" prices to reduce stock.
The 6JS6C tube is a TV Deflection Tube, or "Sweep Tube". Although not meant for transmitting it exhibits sufficient
performance for RF operation through 30 MHz. Each tube can dissipate 30 watts of plate power, 5.5 watts of screen power,
filament voltage of 6.3 volts at 2.25 amps, and has a Cin/Cgp/Cout of 24/0.7/10 pf respectively. The base is a 12-pin socket.
6JS6C Diagram
There will come a time when the finals in your FT101E will need replacing. The FT-101 transceivers were originally
equipped with 6JS6C tubes manufactured by NEC and Toshiba. Other manufacturers tube properties are slightly different
from the original 6JS6C tubes. Therefore, a simple modification to the neutralization circuit must be made to the final
section of the transceiver. The modification consists of replacing the fixed value 100 pf 1000 VDC mica capacitor with a 10
pf 1000 VDC mica capacitor. This capacitor, C125, is in series with the 10 pf variable neutralizing capacitor off of the plate
circuit.
Schematic of FT-101 Power Amplifier Circuit
If this modification has not already been completed on your rig, be sure to use a mica or silver mica of at least 1000 VDC.
Do not substitute a different type because the heat in the final compartment will change the value, and your tubes will fail
prematurely. Also, be very careful to keep all leads short and in exactly the same orientation as the original capacitor.
Before re-neutralizing, open the variable neutralizing capacitor all the way to minimum engagement and follow the
neutralizing instructions in the manual. While dipping the PLATE, remember to adjust the neutralizing capacitor for equal
value meter reading "dips" (Ic meter position) on both sides of the peak when tuning the PLATE control. WARNING! You
are tuning a capacitor in the High Voltage compartment, +600 Volts are present! Always use non-metallic tuning tools. After
neutralization, reset the bias to 60ma with CARRIER and MIC settings at minimum.
List of known 6JS6C tube suppliers:
SND Tube Sales
Radio Electric Supply
Com-West Radio Systems
ESRC
AmpDoc
Electron Tube Enterprises
Vacuum Tubes, Inc.
B B & W
LynTec NOS Electron Tubes
Vintage Electronics
Brent Jessee Recording
Or, Search the web yourself -> 6JS6C
QST- The following performance data is provided by the American Radio Relay League (ARRL) and their publication QST.
A full copy of this table was found on the Technical Information Service section on the ARRL web page. The table depicted
over 60 radios and their performance data. I have shown only the Yaesu radios from the 1970's that apply to this web page.
QST Reviews of Amateur HF Transceivers
QST | Xmtr | Rcvr
Yaesu FT-101 HF Transceiver Home Page, NW2M http://www.qsl.net/nw2m/
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